A group of Microsoft researchers has used supervised machine learning to try and improve detection of fraudulent user accounts.
With Skype as their test platform, the group says it was able to achieve 68 per cent successful detection of fake accounts within four months of activity, while keeping false positives down to 5 per …

Re: Seeing as they didn't .....

68% maybe ok if it uses a methodology that has nearly no false positives but combined with a 1 in 20 false positive is pretty poor. You could probably get similar stats by assuming anyone who sends a URL is a spammer